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|## page was renamed from How do I detect the circles/round shapes in a color image?|
I just installed the python-opencv package on Ubuntu 10.10 and I was wondering how I can use it to detect the circles/round figures in an RGB image. I am not an expert in images and I do not know what terms like HSV and 8-bit image mean(I know these two now, of course).
I tried this code, which I adapted from a website, and it doesn't work:
1 import cv 2 3 def main(): 4 5 storage = cv.CreateMemStorage(0) 6 7 im = cv.LoadImageM("Proba1.jpg") 8 size = (640, 480) 9 hsv_im = cv.CreateImage(size, cv.IPL_DEPTH_8U, 3) 10 thresholded = cv.CreateImage(size, cv.IPL_DEPTH_8U, 1) 11 thresholded2 = cv.CreateImage(size, cv.IPL_DEPTH_8U, 1) 12 13 hsv_min = cv.Scalar(0, 50, 170, 0) 14 hsv_max = cv.Scalar(10, 180, 256, 0) 15 hsv_min2 = cv.Scalar(170, 50, 170, 0) 16 hsv_max2 = cv.Scalar(256, 180, 256, 0) 17 18 cv.CvtColor(im, hsv_im, cv.CV_BGR2HSV) 19 cv.InRangeS(im, hsv_min, hsv_max, thresholded) 20 cv.InRangeS(im, hsv_min2, hsv_max2, thresholded2) 21 cv.cvOr(thresholded, thresholded2, thresholded) 22 # pre-smoothing improves Hough detector 23 cv.Smooth(im, im, cv.CV_GAUSSIAN, 9, 9) 24 25 26 circles = cv.HoughCircles(im, im, cv.CV_HOUGH_GRADIENT, 2, thresholded.height/4, 100, 40, 20, 200) 27 28 29 if __name__ == '__main__': 30 main()
The error I get is: OpenCV Error: Sizes of input arguments do not match () in cvCvtColor, file /build/buildd/opencv-2.1.0/src/cv/cvcolor.cpp, line 2208OpenCV Error: Sizes of input arguments do not match () in cvCvtColor, file /build/buildd/opencv-2.1.0/src/cv/cvcolor.cpp, line 2208
I really do NOT understand the whole code above(not the error, the code) since there is no good documentation about opencv and python available. I also tried installing pyopencv but it didn't work.
I would be very glad if someone could show me a code sample that takes a .jpg image, makes it 8-bit(because this is another error it gives me) and detects the circles in it. It would also be nice if you could tell me a good opencv tutorial for python.
Thanks for your time and interest and sorry for my grammar.
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